tests: Update ara 1.5.7 to 1.6.1 (#9737)

1.5.7 was released Aug 2, 2021 and 1.6.1 came out on Dec 13, 2022.

There's been a good amount of new features, improvements and fixes since
1.5.7 and the changelogs for each version are available in the docs:
https://ara.readthedocs.io/en/latest/changelog-release-notes.html

tests/requirements-2.11.txt

@@ -8,4 +8,4 @@ molecule==3.0.6
 molecule-vagrant==0.3
 testinfra==5.2.2
 python-vagrant==0.5.15
-ara[server]==1.5.7
+ara[server]==1.6.1

tests/requirements-2.12.txt

@@ -8,4 +8,4 @@ molecule==3.0.6
 molecule-vagrant==0.3
 testinfra==5.2.2
 python-vagrant==0.5.15
-ara[server]==1.5.7
+ara[server]==1.6.1